@book { JahrbuchfrPdagogik1999,
    title = "Jahrbuch für Pädagogik 1999",
    author = "Karl-Christoph {Lingelbach} and Hasko {Zimmer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1110154"
}